Utilization and requirement of dietary protein taking into account the dermal and miscellaneous nitrogen losses in Japanese women.

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概要

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• Utilization and requirement of mixed protein in the con-ventional Japanese diet and the obligatory integumental and micellaneous nitrogen losses were measured in female subjects. Twelve female students aged 18 to 24 years were given conventional low-protein diets at N intake levels of 50, 70, and 90mg/kg/day for 10 days. Constituents of the diets corresponded to those of average intake of the Japanese in recent years (1982). N balances were estimated and regression equations between N intake (X) and N balance (Y) were calculated by the multiple level-constant variation method. The equation was Y=0.426X-40.0 (n=36, γ=0.615, p <0.01) and the intersection of the regression line with zero nitrogen balance was 93.9±14.3mgN/kg/day. The mean digestibility was 92.2±4.7%. In another experimental group, nitrogen losses due to hair, nails, and menstruation in ten Japanese women were 0.624 ±0.1.72, 0.020±0.005, and 1.76±0.68 mg/kg/day, respectively. In a third experi-mental group, mean of the integumental N losses was 2.8mg/kg/day in both the subjects given a low-protein diet (19 women) and an ordinary-protein diet (4 women). It increased to 12.7mg N/kg/day when subjects exercised in summer (4 subjects). The protein requirement in the conventional Japanese diet estimated as the sum of the mean requirement of dietary protein and obligatory dermal and miscellaneous nitrogen losses in Japanese women was 99.1mg N/kg/day or 0.62g protein/kg/day. The net protein utilization (NPU) of the proteins at the N intake level for N equilibrium was estimated as 48.

• 財団法人 学会誌刊行センターの論文

著者

• 小池 五郎

  Kagawa Nutrition College

• 金子 佳代子

  Faculty of Education, Yokohama National University

• 石川 和子

  Kagawa Nutrition College

• 瀬戸口 京子

  Kagawa Nutrition College

関連論文

• Obligatory N Loss and Utilization of Egg and Rice Mixed Protein in Young Japanese Women
• Urinary Calcium and Calcium Balance in Young Women Affected by High Protein Diet of Soy Protein Isolate and Adding Sulfur-Containing Amino Acids and/or Potassium
• Utilization of soy protein isolate mixed with rice protein in Japanese women.
• Effect of protein intake level on urinary energy/nitrogen ratio in Japanese.
• Utilization and requirement of egg protein in Japanese women.
• Effect of fiber on protein, fat and calcium digestibilities and fecal cholesterol excretion.
• Utilization and requirement of dietary protein taking into account the dermal and miscellaneous nitrogen losses in Japanese women.
• Effect of methionine supplementation of a soy protein isolate on short-term nitrogen balance in young women.

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